Velomarkt.ch is the place to go and buy second hand bikes and equipment in Switzerland. A lot of the advertisers are still private individuals unlike sites like ebay.ch or ricardo.ch. In typical Swiss style, the equipment is generally very high spec and not overly abused, of course you have to cut through a fair amount of optimistic pricing too, but there is enough traffic (say 40-50 new bikes a day) to ensure its a reasonable market.
Haul so far 200chf for a 1000chf set of MTB forks, 200chf more for a 1000chf set of wheels for aforementioned MTB. One Specialized Roubaix carbon road bike in good condition 800chf vs list price 4400chf.